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notooth
Journeyman III
Journeyman III

Need help with this code

Jump to solution

Hello,

I have a code and the output like this:

__kernel void Generate21(__global ulong* out)

{

          int num = get_global_id(0);

          out[num] = (ulong)0x0123456789abcdef;

}

cl_mem cl_Matrix = clCreateBuffer(context, CL_MEM_READ_WRITE, 2*64*8, NULL, NULL);

cl_kernel Generate21 = clCreateKernel(program,"Generate21", NULL);

status = clSetKernelArg(Generate21, 0, sizeof(cl_mem), (void *)&cl_Matrix);

*global_work_size = 2;

status = clEnqueueNDRangeKernel(commandQueue, Generate21, 1, NULL, global_work_size, NULL, 0, NULL, NULL);

__int64 Matrix[2][64];

status = clEnqueueReadBuffer(commandQueue, cl_Matrix, CL_TRUE, 0, 2*64*8, Matrix, 0, NULL, NULL);

for (char k=1; k>=0; k--)

          {

                    for (char i=63; i>=0; i--)

                    {

                              for (char j=63; j>=0; j--)

                                        printf("%d", (Matrix>>j)&1);

                              printf("\n");

                    }

                    printf("\n");

          }

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0000000100100011010001010110011110001001101010111100110111101111

0000000100100011010001010110011110001001101010111100110111101111

Can you help me fix the code to get the output like this, in 1 command to execute the kernel:

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0000000100100011010001010110011110001001101010111100110111101111

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0000000100100011010001010110011110001001101010111100110111101111

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1 Solution

Accepted Solutions
german
Staff
Staff

Re: Need help with this code

Jump to solution

notooth wrote:

Can you help me fix the code to get the output like this, in 1 command to execute the kernel:

The simplest way should be

__kernel  void Generate21(__global ulong* out)

{

  int num = get_global_id(0);

    out[num * 64] = (ulong)0x0123456789abcdef;

}

View solution in original post

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9 Replies
himanshu_gautam
Grandmaster
Grandmaster

Re: Need help with this code

Jump to solution

What is __int64? The right thing to use is "cl_ulong".

Can you confirm if the issue reported http://devgurus.amd.com/message/1287346#1287346 is solved?

Also, I am not sure if "%d" would print a 64-bit integer. Can you check?

In case of doubt, use std::cout to print.

Also, Please tell which platform you are working on. Is it 32-bit (or) 64-bit?

Also, using a "char" for a for loop index looks weird. Can you use an "int" instead?

Also, Your print messages are not separated by even a space.

Nobody can make sense out of this kind of messages.

Please tell us what is the expectation mismatch here. What is going wrong?

Why cant you just print the output of the kernel and see if the value is set to whatever you are setting the kernel.

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notooth
Journeyman III
Journeyman III

Re: Need help with this code

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__int64 is an 8 bytes data type. I think "cl_ulong" is a data type created on GPU, and "__int64" is a data type created on host. I replied your answer, please have a look http://devgurus.amd.com/message/1287346#1287346

"%d" would not print a 64-bit integer. In my code, "%d" printed bits of a 64-bit integer. I used "char" for a loop index to safe resource of the host. But "int" is also ok for me.

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himanshu_gautam
Grandmaster
Grandmaster

Re: Need help with this code

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notooth.

Your understanding is wrong.

"ulong" inside OpenCL kernel represents 64-bit unsigned integer - Please refer Chapter 6 of OpenCL spec.

"cl_ulong" is the host side data-type that corresponds to "ulong" in the kernel.

i.e. If you wanted to create an array of 64-bit integers, you need to use "cl_ulong" in your host code

and access it as a "ulong *" pointer in the kernel code.

Hope this is clear.

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german
Staff
Staff

Re: Need help with this code

Jump to solution

notooth wrote:

Can you help me fix the code to get the output like this, in 1 command to execute the kernel:

The simplest way should be

__kernel  void Generate21(__global ulong* out)

{

  int num = get_global_id(0);

    out[num * 64] = (ulong)0x0123456789abcdef;

}

View solution in original post

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himanshu_gautam
Grandmaster
Grandmaster

Re: Need help with this code

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Notooth,

You are spawning only 2 workitems (global size)!

And, I dont see any for loops inside your kernel.

So, effectively you are setting only 2 elements in the array.

Also, I am not sure if global work size of 2 will be accepted... Just check the status of the kernel call as well.

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himanshu_gautam
Grandmaster
Grandmaster

Re: Need help with this code

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__kernel  void Generate21(__global ulong* out)

{

  int num = get_global_id(0);

    out[num * 64] = (ulong)0x0123456789abcdef;

}

No. He actually needs to spin a FOR loop for 64 times. (his global work size is actually 2)

The code snippet above will set two items that are 64 ulongs apart.

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german
Staff
Staff

Re: Need help with this code

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himanshu.gautam wrote:

__kernel  void Generate21(__global ulong* out)

{

  int num = get_global_id(0);

    out[num * 64] = (ulong)0x0123456789abcdef;

}

No. He actually needs to spin a FOR loop for 64 times. (his global work size is actually 2)

The code snippet above will set two items that are 64 ulongs apart.

notooth didn't ask how to clear the rest of memory. The question was how to make the output like that. So that is the answer. 2 values - 2 locations. Nothing less or nothing more.

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notooth
Journeyman III
Journeyman III

Re: Need help with this code

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Thanks for all the replies.

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himanshu_gautam
Grandmaster
Grandmaster

Re: Need help with this code

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Oh yes. You are right. I am sorry.

Actually, now I understand that the mountain of zeroes are nothing but binary representation of the number.

And yes, your solution should work fine for the desired pattern.

Appreciate your time on this, Thanks

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